JPH0414468Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention relates to a tuck-in device for a piece loom,
In particular, the present invention relates to improvements in grippers that frictionally hold the ends of inserted weft threads.

[Conventional technology]

The gripper of the tuck-in device was developed in 1983.
As shown in No. 53379, it usually consists of a fixed gripper head having one yarn gripping surface and a movable yarn gripper having another yarn gripping surface and guided by a guide shaft relative to the gripper head. These are designed to sandwich and hold the weft thread.

However, when the tuck-in needle draws the end of the weft thread into the opening for the next weaving cycle,
Since the end of the weft thread gripped by the grippers is pulled out from between the grippers, when the weft thread is pulled out, the weft thread is squeezed by the thread gripping surface of the grippers, and as a result, wind is generated on this thread gripping surface. Cotton sticks to it. Further, the guide shaft also serves as a guide for the weft thread, and the weft thread is in contact with the circumferential surface of the guide shaft, and around the guide shaft, the gripper head and the yarn gripper come close to each other and face each other. Fly fluff adheres to the guide shaft and tends to stagnate, causing the adhered fluff to wrap around the guide shaft. Further, the adhered fluff enters the guide hole, clogging the guide hole and making it impossible for the guide shaft to move smoothly. In such a state, the thread gripping force of the gripper decreases, making it easier to tuck the thread, resulting in a defective yarn with a defective selvage. For this reason, the loom must be stopped frequently to remove the fluff that has adhered to it.

Therefore, conventionally, an air blow nozzle is provided toward the thread gripping surface of the gripper, and the attached fluff is blown off and removed by air blow. However, since the fluff wrapped around the guide shaft is not completely removed and remains little by little, manual removal work is required, and the removal function cannot be said to be sufficient. Further, there are large restrictions on the installation location of the air blow nozzle, and there are also problems such as wasted air.

[Purpose of invention]

Therefore, an object of the present invention is to prevent fluff from adhering to the thread gripping surface of the gripper, especially the guide shaft, and to enable it to be easily removed by air blowing or the like even if fluff adheres.

[Devised solution]

Therefore, in the present invention, a thread guide is attached in front of the guide shaft on the side surface of the thread gripping surface of the gripper head to restrict the weft thread from reaching the guide shaft. As a result, even if fluff adheres to the yarn gripping surface, it can be removed along with the movement of the weft yarn during the tuck-in operation, or can be easily removed by air blowing.

Furthermore, the present invention forms a wide space around the connection between the guide shaft and the yarn gripper. Therefore, the adhesion of fluff around the guide shaft of the gripper, the winding of fluff around the guide shaft, and furthermore, the intrusion of fluff into the guide hole and the resulting clogging can be prevented.

〔Example〕

1 and 2 show a gripper 1 according to the invention.

This gripper 1 includes a gripper head 2, a yarn gripper 3, a guide shaft 4, and a thread guide 5.
It is made up of.

The gripper head 2 is fixedly attached to, for example, a frame by a support arm 6, and the lower surface on the tip side thereof is a fixed thread gripping surface 7.
It is formed as. In addition, the thread guide 5
is on the side of the gripper head 2, and the guide shaft 4
It is provided vertically in front of the gripper head 2, and is attached to the gripper head 2, for example.

Further, the upper surface of the yarn gripper 3 is formed as a movable yarn gripping surface 8, and a guide shaft 4 is fixed to one end in an upright state. This guide shaft 4 is connected to the gripper head 2.
It is slidably fitted in the guide hole 9 formed on the side in the axial direction, and is moved forward and backward by a drive means such as a drive cylinder (not shown) so that the weft thread 10 is held between the thread gripping surfaces 7 and 8. It's summery. The end of the guide hole 9 facing the yarn gripper 3 is cut out in a wide range, so that when the weft thread 10 is gripped, at the rear of the thread guide 5,
A space 16 is formed around the guide shaft 4, which is wider than the space facing the yarn gripping surfaces 7, 8.

FIG. 3 schematically shows a tug-in device 11 equipped with the gripper 1 of the present invention.

The weft threads 10 are inserted into the openings 13 formed by the warp threads 12, intersect with the warp threads 12,
It is woven into a woven fabric 14. This tuck-in device 11 includes a gripper 1 and a tack-in needle 15 according to the present invention.
The end of the weft thread 10 is frictionally held by the tuck-in needle 15, and the weft thread 10 between the loom 14 and the gripper 1 is hooked by the hook portion 15a at the tip of the tuck-in needle 15, and the weft thread 10 is held at the opening 13 of the next weaving cycle. Pull it inside and weave and bend it to form the ears.

Now, in this tuck-in process, the weft thread 10 gripped by the gripper 1 is squeezed in that state by the tuck-in needle 15.
The thread is pulled out from between the thread gripping surfaces 7 and 8. Therefore, at this time, the thread gripping surfaces 7, 8 of the gripper 1
Wind cotton occurs.

However, in the present invention, since a wide space 16 is formed around the guide shaft 4, it is difficult for fluff to accumulate in that part. Further, since the weft yarn 10 is guided by the yarn guide 5 and the weft yarn 10 does not come into contact with the guide shaft 4, adhesion and winding of fluff to the guide shaft 4 does not occur. Further, no fluff enters into the guide hole 9. Therefore, the fly fluff generated on the yarn gripping surfaces 7 and 8 is removed along with the movement of the weft thread 10, and even if some of the fluff adheres, it can be easily removed by existing removal means such as air blowing. I can do it.

[Other Examples]

In the above embodiment, the area around the guide hole 9 on the lower surface of the gripper head 2 is widely cut out to create a wide space 16 around the guide shaft 4 even when the weft thread 10 is gripped, thereby preventing the accumulation of fluff. However, this space 16, as shown in Fig. 4,
The yarn gripper 3 may be formed with a step between the attachment portion of the guide shaft 4 and the yarn gripping surface 8.

[Effect of idea]

In the gripper of the present invention, the weft thread is guided by the thread guide so that the weft thread does not come into contact with the guide shaft, so it is possible to prevent the generation and adhesion of fluff on the thread gripping surface, especially the guide shaft, and the winding of fluff. will also disappear. Further, it is possible to prevent fluff from entering the guide hole and the resulting clogging. Furthermore, when the weft is gripped, a wide space is created around the guide shaft, so even if fluff adheres around the guide shaft, the guide hole will not be clogged, and the fluff will Even if the grip force stagnates, the gripping force does not decrease. Therefore, tack mistakes due to adhesion of fluff can be prevented, and stable weaving can be performed.

[Brief explanation of the drawing]

Fig. 1 is a side view of the gripper of the present invention, Fig. 2 is a front view of the gripper, Fig. 3 is a perspective view illustrating the tuck-in operation of the tuck-in device equipped with the gripper, and Fig. 4 is another embodiment. FIG. DESCRIPTION OF SYMBOLS 1... Gripper of the tuck-in device, 2... Grip head, 3... Yarn gripper, 4... Guide shaft, 5... Thread guide, 7, 8... Thread gripping surface, 10... Weft thread, 16... Space.

Claims (1)

[Scope of Claim for Utility Model Registration] A gripper head 2 forming a yarn gripping surface 7 on the fixed side, a yarn gripper 3 forming a yarn gripping surface 8 on the movable side, and a guide hole connected to the yarn gripper 3 in the gripping operation direction of the gripper head 2. It consists of a guide shaft 4 that reciprocates within a thread gripping surface 7,
The gripper 1 frictionally holds the weft thread 10 between the gripper head 2 and the yarn gripper 3.
A yarn guide 5 for guiding the weft yarn 10 is provided in front of the guide shaft 4 and behind both yarn gripping surfaces 7 and 8 on the side surface of the guide shaft 4, and a connection between the guide shaft 4 and the yarn gripper 3 is provided behind the yarn guide 5. gripper head 2 and yarn gripper 3 around the
A gripper for a tuck-in device characterized in that a space 16 is formed in at least one of the parts, which is wider than the space in which both thread gripping surfaces 7 and 8 face each other.